#rectangle {
  width: 100px;
  height: 50px;
  background: green;
}

#square{
  width: 50px;
  height: 50px;
  background: darkgreen;
}

#diamond {
  width: 50px;
  height: 50px;
  background: darkgreen;
  transform: rotate(45deg);
}

 #circle {
  width: 50px;
  height: 50px;
  background: green;
  border-radius: 50%;
}

#oval {
  width: 100px;
  height: 50px;
  background: darkgreen;
  border-radius: 50%;
} 

#triangle-up {
  width: 0;
  height: 0;
  border-left: 25px solid transparent;
  border-right: 25px solid transparent;
  border-bottom: 50px solid green;
}

#triangle-r {
  width: 0;
  height: 0;
  border-top: 25px solid transparent;
  border-bottom: 25px solid transparent;
  border-left: 50px solid darkgreen;
}

#trapezoid {
	border-bottom: 45px solid green;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  width: 60px;
  height: 0px;
}


/**Heading & container styles**/

h3 {
 font-family: "Calibri";
}

#container {
 border: 2px solid gray;
 margin: auto;
 display: flex;
 flex-wrap: wrap;
 padding: 10px;
}

.shape-container {
 	margin: 50px; 
  text-align: center;
}